Part 1: Fix iPhone White Screen of Death via DFU Mode

DFU means "Default Firmware Update". It can reset your iPhone unconditionally. If you do not back up your iPhone, you must ensure that there is no significant data before using this feature. It will cause data loss.

Step 1. Install the latest iTunes.Step 2. Refer to the figure below. Press the Power button and the Home button at the same time for 10 seconds.

Step 3. Release the Power button and continue pressing the Home button.
Then you will see the prompt "iTunes has detected an iPhone in recovery mode".